<div id="viewReset">
    <div class="btn-group">
        <button id="btn_start" type="button" class="btn btn-primary">
            <i class="fa fa-play-circle-o"></i>开始
        </button>
        <button id="btn_pause" type="button" class="btn btn-primary" style="display: none;">
            <i class="fa fa-pause-circle-o"></i>暂停
        </button>
        <button id="btn_proceed" type="button" class="btn btn-primary" style="display: none;">
            <i class="fa fa-play-circle-o"></i>继续
        </button>
        <button id="btn_stop" type="button" class="btn btn-primary" style="display: none;">
            <i class="fa fa-stop-circle-o"></i>停止
        </button>
    </div>


    <ul id="treeOverlays" style="padding:0"></ul>
    <br />
    总时长: <span id="alltimes">0s</span> &nbsp;&nbsp;
    <br />
    当前:&nbsp;&nbsp;<span id="thisStep">无</span> &nbsp;&nbsp;
    <span id="thistimes"></span>
</div>